<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gradient Animation</title>
    <style>
        body {
            background-color: #000;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }

        .gradient {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: linear-gradient(45deg, #ff6347, #ff69b4, #1e90ff, #00ff7f);
            background-size: 400% 400%;
            animation: gradient-animation 4s ease infinite;
        }

        @keyframes gradient-animation {
            0% {
                background-position: 0% 50%;
            }
            100% {
                background-position: 100% 50%;
            }
        }
    </style>
</head>
<body>
    <div class="gradient"></div>
</body>
</html>
